My water heater is leaking — what do I do in the first 10 minutes?
Shut off the water feeding the tank first, then the power or gas — the cold-water shutoff valve is on the pipe entering the top of the heater. A leaking tank won't fix itself, but ten calm minutes can be the difference between a service call and a flooded floor.
- Turn the cold-water inlet valve (top of the tank) clockwise until it stops. If it's stuck or broken, use the home's main shutoff instead.
- Electric heater: switch off its breaker. Gas heater: turn the gas control dial to OFF.
- Move belongings away and towel up standing water — water heaters live in closets, garages, and basements where a slow leak spreads fast.
- Look at where it's coming from: a drip at a fitting or the relief valve is often repairable; water seeping from the tank body means the tank itself has failed and replacement is the honest answer.
- Call a licensed plumber either way — a leaking tank under pressure only goes one direction.
Water heater repair & replacement → Why water heater flushes protect the warranty → Repair vs. replace a water heater →